DynamoDB - Access Patterns and Query Optimization
What is a likely consequence of using a partition key in DynamoDB that has only a handful of unique values?
What is a likely consequence of using a partition key in DynamoDB that has only a handful of unique values?
easy🧠 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand partition key role
The partition key determines how data is distributed across partitions.Step 2: Analyze low cardinality impact
Few unique partition key values mean many items map to the same partitions, causing hot partitions.Final Answer:
It can cause uneven data distribution leading to performance bottlenecks -> Option DQuick Check:
Low cardinality keys cause hot partitions [OK]
Quick Trick: Low unique keys cause hot partitions [OK]
Common Mistakes:
MISTAKES- Assuming fewer keys improve performance
- Believing DynamoDB auto-balances uneven keys
- Thinking compression reduces partition load
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